Thanks for the reply. I've had a shot of what you've suggested but with no joy. Tried all the combinations I could think of as well. Disabling composite stops the game I was running from displaying at all so couldn't test it, but a lesser version could be seen in Open Arena still. Triple buffering on and off makes no noticeable difference. You can see from glxgears that it thinks it's synced.
Running synchronized to the vertical refresh. The framerate should be
approximately the same as the monitor refresh rate.
303 frames in 5.0 seconds = 60.415 FPS
301 frames in 5.0 seconds = 60.021 FPS
301 frames in 5.0 seconds = 60.017 FPS
And from some other output it appears that it is showing roughly the same refresh as my monitor (no sure why xrandr is showing 50Hz???):
Screen 0: minimum 320 x 240, current 1280 x 1024, maximum 1280 x 1024
default connected 1280x1024+0+0 0mm x 0mm
1280x1024 50.0* 51.0
1024x768 54.0 55.0 56.0
800x600 58.0 59.0 60.0 61.0
640x480 63.0 64.0 65.0 66.0 67.0
512x384 68.0 69.0
320x240 71.0 72.0
And the monitor's OSD shows V Refresh of 60.0Hz.
In terms of what is to be seen in the video there's no interlacing on the video but you may be taking about the fact the monitor is picked up a bit weirdly on my camera (there's kind of the appearance of diagonal lines). But the tearing I'm talking about is vertical on the monitor and can be seen in the video when it's moving (especially round the light at the start). It's not as stable as the tearing in the game so it's easier to miss.